In order to solve the problems of complicated operation, the difficulty of welding precision, and the low production efficiency, this paper presented a new pipeline engraving technology based on numerical control simulation of pipeline bending. The secondary development technology based on PROE was adopted to extract the characteristic information in the 3D model of pipeline components and analyzed the NC code. According to the obtained part characteristic information and the YBC information of the pipeline, the engraving post of the single pipe and related connecting parts was calculated. And the experimental verification and algorithm precision analysis were carried out. The experimental results show that the method is simple in operation and good at generality, which effectively improves the pipeline engraving efficiency and welding precision.